Merge tag 'mem-2023-05-23' of https://github.com/davidhildenbrand/qemu into staging

Hi,

"Host Memory Backends" and "Memory devices" queue ("mem"):
- New "offset" option for memory-backend-file

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# gpg: Good signature from "David Hildenbrand <david@redhat.com>" [unknown]
# gpg:                 aka "David Hildenbrand <davidhildenbrand@gmail.com>" [undefined]
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* tag 'mem-2023-05-23' of https://github.com/davidhildenbrand/qemu:
  hostmem-file: add offset option

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

3 files changed, 5 insertions, 1 deletions

diff --git a/include/exec/memory.h b/include/exec/memory.h
index 6f24a3dd46..c3661b2276 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -1326,6 +1326,7 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
  * @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM,
  *             RAM_NORESERVE,
  * @path: the path in which to allocate the RAM.
+ * @offset: offset within the file referenced by path
  * @readonly: true to open @path for reading, false for read/write.
  * @errp: pointer to Error*, to store an error if it happens.
  *
@@ -1339,6 +1340,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
                                       uint64_t align,
                                       uint32_t ram_flags,
                                       const char *path,
+                                      ram_addr_t offset,
                                       bool readonly,
                                       Error **errp);
 
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index f4fb6a2111..90a8269290 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -110,6 +110,7 @@ long qemu_maxrampagesize(void);
  *  @ram_flags: RamBlock flags. Supported flags: RAM_SHARED, RAM_PMEM,
  *              RAM_NORESERVE.
  *  @mem_path or @fd: specify the backing file or device
+ *  @offset: Offset into target file
  *  @readonly: true to open @path for reading, false for read/write.
  *  @errp: pointer to Error*, to store an error if it happens
  *
@@ -119,7 +120,7 @@ long qemu_maxrampagesize(void);
  */
 RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
                                    uint32_t ram_flags, const char *mem_path,
-                                   bool readonly, Error **errp);
+                                   off_t offset, bool readonly, Error **errp);
 RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
                                  uint32_t ram_flags, int fd, off_t offset,
                                  bool readonly, Error **errp);
diff --git a/include/exec/ramblock.h b/include/exec/ramblock.h
index adc03df59c..69c6a53902 100644
--- a/include/exec/ramblock.h
+++ b/include/exec/ramblock.h
@@ -40,6 +40,7 @@ struct RAMBlock {
     QLIST_ENTRY(RAMBlock) next;
     QLIST_HEAD(, RAMBlockNotifier) ramblock_notifiers;
     int fd;
+    uint64_t fd_offset;
     size_t page_size;
     /* dirty bitmap used during migration */
     unsigned long *bmap;